do not remove alpha or production tags even if stale (#658)
do not remove alpha or production tags even if stale (#658)

this makes no difference to actual autoscaling behavior, but it's nice
for debugging purposes to see the last prod tag even if it is stale
chanzuckerberg/idseq-web,chanzuckerberg/idseq-web,chanzuckerberg/idseq-web,chanzuckerberg/idseq-web,chanzuckerberg/idseq-web